backstage release v3.7.0

(agent-platform) Keep a compact session header at the top while reading by @marians — Scrolling down a long session turns its header into a compact bar at the top of the page with the name, state, agent, Show tool activity, pin and actions menu; scrolling back up restores it. At phone width the bar leaves out Show tool activity.

(agent-platform, muster) Build shell links through route refs by @marians — No visible change: links into the Agent Platform are built from its route definitions instead of written-out addresses, in preparation for moving its pages to new addresses.
(app, muster) Map old Agent Platform addresses to the new URL tree by @marians — An old link to a connector’s Settings tab now opens the connector’s Tools tab. The rest prepares redirects for the Agent Platform’s move to new addresses and changes nothing yet.

(agent-platform) Measure context from the newest model call and correct Claude windows by @marians — In a session’s cost popover, Context used shows what the model was last sent, no longer a sum over the turn’s calls (969.0k of 200.0k · 100%), against a 1M window for current Claude models such as Opus 5.5. Above the configured window it says so; Claude Code Harness sessions show Not reported.
(muster) Read mcpservers and workflows in muster’s namespace when a cluster-wide list is refused by @teemow — For a person with only namespaced Agent Platform access, the Customize pages no longer show Errors when trying to fetch resources from …, and list the MCP servers the person may read in muster’s namespace.

(ci) Align files according to platform standards by @giantswarm-align-files[bot] — Updates the generated CircleCI workflow, auto-release workflow and Makefile from the shared templates in giantswarm/github.

Full Changelog: https://github.com/giantswarm/backstage/compare/v3.6.0...v3.7.0